No, here we are not talking about the actions of AI, but the identities of living rivals (such noobs) who likes to make a rush. If the tank is usually not a problem, here's a helicopter can specifically pull the nerves, because if you do not know about the plans of an opponent, and prepare for it is difficult

living rivals rushing right after the game started is quite annoying, particulary when they use helicopters, but I have to say, I like to finish a game with a huge assault with all the weoponary you can imagine

I've had multiple helicopter rushes at me, and it's usually easy to counter. My own recon will be heading out to cover the area, so I'll see them coming. Then it's just a matter of putting my infantry and IFVs in a position that the helos will fly over them, preferably while in range of a few Tunguskas.

If someone's rushing they're usually not scouting and will fly right over a horder of infantry and ifvs which will just cut them apart before they can fire.

Tank rushes are harde to defend against, but also fail against someone who knows it's coming. Infantry along the suspected paths with a line of your own armor and ATGMs will massacre it.

Rushes are only good against pepole who would get caught by surprise by the rush, aka those who don't send out recon, aka 'noobs'. Anyone who deploys a basic recon screen should be able to handle a rush and then dominate afterwords.

In my opinion, the tank rushes are the bane of my existance. Helicopter rushes are easily annihalated by Rolands or Gepards, plus an array of SAM infantry, but tank rushes by smart foes are exceedingly irritating. Especially when your enemy knows the exact route to take to avoid open areas and takes some flame tanks.